Water-heater.



N. G. GOREAU.

WATER HEATER. APPLICATION FILED JUNE8,1909.

Patented May 14, 1912.

Attorney UNITED STATES PATENT OFFICE:

NELSON eheonmm, on NEW ORLEANS, LOUISIANA.

'. WATER-HEATER.

To all whom it may concern:

Be it known that I, NELSON G. GonEAU, a citizen of the United States,residing at New Orleans, in the parish ofOrlea ns and State ofLouisiana, have invented a certain new and useful Improvement 'in Water-Heaters, of which the following is atspecification.

My invention relates to water heaters of the class generally known asinstantaneous water heaters. 3

The object of the invention is to provide a new and eflicient heatingcoil.

The foregoing and other advantages of the invention are hereafter fullyexplained in connection with a detailed description of the drawing whichis a vertical section in diagrammatic form of an exemplifying apparatusembodying the invention. I

' Reference character 1 designates a casing in which the heating coil 2is mounted. The coil consists of an upper flat spiral 3, the centerportion of which is continued to form a downwardly flaring conicalspiral 4. The pipe constituting the coil is flattened and the longeraxis arranged vertically as shown, so that the coils of the pipemay bearranged close together and so that a very large portion of the pipesurface is directly exposed to the heat from the burners. The coil maybe arranged in'many different ways. By flattening the tube composing thecoil and arranging the turns of the coil so that a space is left betweenthe turn, a very large from surface of the coil is. exposedjto the heatthe burners. Thesei coils become quickly coated with sootors carbonwhich readily absorbs the heat and communicates it to the coil. Myheating coil consisting of a flattened tube, the convolutions of whichare spaced apart in the manner shown or any reasonable variation thereofis an exceedingly efiicient heating element.

.VVater enters the coilat 5 and passes out at 6. The end 6 of the coilcommunicates through-a valve 7 with the motor-cylinder 8 through inletport 9. The cylinder also has an outlet port 10 which is connected tothe service pipe through which water isled to different faucets to besupplied. The out-- let port 10 may, if desired, be somewhat restrictedby means of a flange 11 cast in the cylinder. Within the cylinder ispiston 12, connected to valve stem'13. The "piston is provided with a.port or by-pass 14 in which valve 15 is seated in such a way that ISpecification of Letters Patent.

Patented May 14, 1912. f Application filed June 8, 1909. Serial No.500,824.

a nut 15 on the stem serves to adjust the tension of the spring. Theupper end of the valve stem 13 above the piston carries a thermostat 17,consisting of a series of dished brass disks 18 arranged in pairs, eachpair being encircled by a steel ring 19., The several pairs of disks aresecured together as shown and any convenient number of pairs may be usedto give the desired expansion. In the upper end of the cylinder is ascrew 20. provided with a lock nut, servmg as an adjustable stop tolimit the movement of the thermostat.

The apparatus so far described operates as follows: When any servicevalve is opened water is drawn through the coil and as soon as it passesin any considerable quantity through inlet port 9 into the cyl' inderthe piston 12 is raised until the upper end 'ofthe thermostat engagesthe adjustable stop. The spring controlling the bypass'valve 15 is madeof sufficient strength to cause the water to raise the piston before thevalve is opened. The valve having reached its limit of travel the fluidpressure raises the by-pass valve 15' and water .flows through thepiston and discharge port 10 to the service pipe. The u ward movementofthe piston lights the main burners under the miles will be hereafterdescribed and the .water is rapidly-heated. As the heated waterpassesaround the thermostat its dished brass plates expand and being retainedby the steel rings '19 this expansion results In a separation of thecenter points of the plates, that is an elongation of the thermostat.This elongation of the thermostat is proportional to the heat of thewater and as the upper end of the thermostats-is in engagement with stop20 the valve stem 13 is moved downward as the water heats 'aud ispermitted to move upward as the water cools so that an automaticregulation of the temperature of the water is effected.

When the service valve is closed water ceases to flow through the motorcylinder. small amount of water may still pass through the by-passvalve'which does not seat fully and the piston 12 therefore descendsunder influence of gravity and a spring which will be later described.This movement of the piston shuts off the main gas burners and heatingof "the water is discontinued. 7

Below the motor is the gas valve 30 which I has two ports: 31 the mainport, and.32

' lower the valve stem 13 on which the valve.

the pilot port. Gas enters at 33. Port 31 is closed by the main gasvalve 34. A spring compressed between the valve and the valve casingtends to close the valve and to lating valve 39 through pipe to thepilot burner 41. t

The pilot burner is continually lighted and may be regulated by valve 39so that the flame is very small, requiring a mini- 7 mum quantity ofgas. When valvestem 13 is raisedby the motor piston the main valve 34 israised and gas is admitted to the main burners 38. The pilot burnertakes its gas from the same source as the main burners and when thepressure in the supply pipe 33 is reduced by opening the main valve thepilot light would frequently be ex tinguished because of the reductionof pressure in the supply pipe and because, of the rush of airand gasfrom the main burners arrangement of the pilot valve 36 which 1,.

opens concurrently with the main valve. Therefore whenever the mainvalve 1s opened the pilot light receives an additional quantity of gaswhich prevents it from being extlnguished.

The motor cylinder may be conveniently supported by a bracket secured tothe valve casing 30.

Other advantages of the structure will be apparent to'persons versed inthe art with- 1 out description and variations which may be made in thestructure without departing from the invention are also evident.

I claim:

In water heating apparatus, the combination of a lower heating coilcomposed of a tube of vertically elongated cross section, theconvolutions of the tube being arranged approximately in conical formand just far enough apart to permit flame to pass between the two, andan approximately flat heating coil above the first, the coils beingconnected in series.

NELSON Gr. GOREAU.

Witnesses Eu. T. CERVILLIER, Louis DENNIS.

